LSM340J/TR13 Equivalent & Substitute Parts

Part Overview

The LSM340J/TR13 is a Schottky rectifier diode manufactured by Microchip Technology, rated for 40 V DC reverse voltage and 3 A average rectified current in a DO-214AB surface mount package. This component is classified as Active product status and is designed for fast recovery applications with switching speeds ≤ 500 ns at currents > 200 mA. The part is supplied in Tape & Reel packaging format.

Equivalent and substitute parts are identified based on matching electrical specifications (voltage rating, current capacity, forward voltage characteristics, and switching speed) and mechanical compatibility (package type and mounting method). Substitutes enable design flexibility, support supply chain continuity, and accommodate different manufacturing certifications and compliance requirements.

Key Parameters

Parameter	LSM340J/TR13 Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	520 mV @ 3 A	mV
Speed - Fast Recovery	≤ 500 ns, > 200 mA (Io)	ns
Current - Reverse Leakage @ Vr	1.5 mA @ 40 V	mA
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Schottky	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following electrical and mechanical criteria:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V or higher
Current - Average Rectified (Io): 3 A or higher
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)
Package / Case: DO-214AB or compatible SMC package
Mounting Type: Surface Mount
Technology: Schottky

Secondary Compatibility Factors:

Forward voltage (Vf) at rated current: Acceptable range determined by circuit design margins
Reverse leakage current: Lower values indicate superior performance
Operating temperature range: Must encompass application requirements
RoHS and REACH compliance status: Regulatory alignment with end-use requirements

Parts are grouped into two categories:

Group 1 - Direct Electrical Equivalents (40 V, 3 A, DO-214AB/SMC): Parts matching all primary criteria with identical voltage and current ratings, enabling direct substitution in most applications.

Group 2 - Higher Voltage Rating (50 V, 3 A, DO-214AB/SMC): Parts with elevated voltage ratings suitable for applications requiring additional voltage margin or operating in higher voltage environments.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 3A [mV]	Reverse Leakage @ Vr [µA/mA]	Package	Tj (Max) [°C]	RoHS Status
LSM340J/TR13	Microchip Technology	40	3	520	1.5 mA @ 40V	DO-214AB	150	Non-compliant
B340-13-F	Diodes Incorporated	40	3	500	500 µA @ 40V	DO-214AB	125	ROHS3 Compliant
B340Q-13-F	Diodes Incorporated	40	3	500	500 µA @ 40V	DO-214AB	150	ROHS3 Compliant
B350-13-F	Diodes Incorporated	50	3	700	500 µA @ 50V	DO-214AB	125	ROHS3 Compliant
CDBC340-G	Comchip Technology	40	3	500	500 µA @ 40V	DO-214AB	125	ROHS3 Compliant
SK34-TP	Micro Commercial Co	40	3	500	500 µA @ 40V	DO-214AB	150	ROHS3 Compliant
SS34	MDD	40	3	—	500 µA @ 40V	DO-214AC	125	ROHS3 Compliant
SS34-E3/57T	Vishay General Semiconductor - Diodes Division	40	3	500	500 µA @ 40V	DO-214AB	125	ROHS3 Compliant
SS34-E3/9AT	Vishay General Semiconductor - Diodes Division	40	3	500	500 µA @ 40V	DO-214AB	125	ROHS3 Compliant
SS34-M3/57T	Vishay General Semiconductor - Diodes Division	40	3	500	500 µA @ 40V	DO-214AB	125	ROHS3 Compliant
STPS340S	STMicroelectronics	40	3	630	20 µA @ 40V	DO-214AB	150	ROHS3 Compliant

Engineering Selection Recommendations

Group 1 Direct Equivalents (40 V, 3 A Rating):

The following parts are electrically and mechanically equivalent to the LSM340J/TR13 and are suitable for direct substitution:

B340Q-13-F (Diodes Incorporated): Matches operating temperature range (-55°C to 150°C) and provides ROHS3 compliance with AEC-Q101 automotive qualification. Tape & Reel packaging aligns with original part format.
SK34-TP (Micro Commercial Co): Maintains full operating temperature range (-55°C to 150°C) and provides ROHS3 compliance. Tape & Reel packaging format matches original specification.
SS34-E3/57T, SS34-E3/9AT, SS34-M3/57T (Vishay General Semiconductor - Diodes Division): All three variants provide ROHS3 compliance and fast recovery characteristics. SS34-E3/9AT and SS34-M3/57T are available in Tape & Reel format. Forward voltage specification of 500 mV @ 3 A is lower than the main part, indicating improved efficiency characteristics.
STPS340S (STMicroelectronics): Provides ROHS3 compliance and maximum junction temperature of 150°C. Reverse leakage current of 20 µA @ 40 V is significantly lower than the main part, indicating superior leakage performance. Forward voltage of 630 mV @ 3 A is higher than the main part.
CDBC340-G (Comchip Technology): Provides ROHS3 compliance with DO-214AB package compatibility. Maximum junction temperature is 125°C, which is lower than the main part.
B340-13-F (Diodes Incorporated): Provides ROHS3 compliance with forward voltage of 500 mV @ 3 A. Maximum junction temperature is 125°C. Available in Cut Tape & Digi-Reel packaging.

Group 2 Higher Voltage Rating (50 V, 3 A Rating):

B350-13-F (Diodes Incorporated): Rated for 50 V DC reverse voltage, providing additional voltage margin for applications operating near the 40 V limit. ROHS3 compliant. Forward voltage is 700 mV @ 3 A. Maximum junction temperature is 125°C. Suitable for applications requiring higher voltage headroom.

Package Consideration:

SS34 (MDD): Supplied in DO-214AC (SMA) package rather than DO-214AB (SMC). This represents a different physical package format and requires PCB layout modification. Not recommended for direct substitution without design review.

Compliance Status:

The LSM340J/TR13 is RoHS non-compliant. All listed substitute parts are ROHS3 compliant, enabling use in applications with RoHS regulatory requirements. All parts maintain REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can I substitute the LSM340J/TR13 with any of the listed parts without circuit modification?

A: Parts within Group 1 (40 V, 3 A rating) are electrically and mechanically compatible with the LSM340J/TR13. Direct substitution is supported for B340Q-13-F, SK34-TP, SS34-E3/57T, SS34-E3/9AT, SS34-M3/57T, STPS340S, CDBC340-G, and B340-13-F. The SS34 part (SMA package) requires PCB layout modification and is not recommended for direct substitution.

Q: What is the difference between DO-214AB and DO-214AC packages?

A: DO-214AB (SMC) and DO-214AC (SMA) are different surface mount package formats with different physical dimensions and PCB footprints. The LSM340J/TR13 uses DO-214AB. The SS34 uses DO-214AC. These packages are not interchangeable without PCB redesign.

Q: Why does the B350-13-F have a higher forward voltage (700 mV) compared to the main part (520 mV)?

A: The B350-13-F is rated for 50 V DC reverse voltage, compared to 40 V for the LSM340J/TR13. Higher voltage ratings typically result in higher forward voltage drops due to semiconductor physics. This part is suitable for applications requiring higher voltage margin but will generate more heat at the same current level.

Q: Is the LSM340J/TR13 RoHS compliant?

A: No, the LSM340J/TR13 is RoHS non-compliant. All listed substitute parts are ROHS3 compliant, enabling use in applications with RoHS regulatory requirements.

Q: What does AEC-Q101 qualification mean for the B340Q-13-F?

A: AEC-Q101 is an automotive electronics qualification standard. The B340Q-13-F meets this qualification, indicating it is suitable for automotive applications and has undergone rigorous reliability testing specific to automotive environments.

Q: Can I use the B350-13-F (50 V) in place of the LSM340J/TR13 (40 V)?

A: Yes, the B350-13-F can be used in applications designed for 40 V operation. The higher voltage rating provides additional safety margin. However, the forward voltage is higher (700 mV vs. 520 mV), which will increase power dissipation and heat generation at the same current level. Circuit thermal analysis is required to confirm acceptability.

Q: What is the significance of reverse leakage current differences between parts?

A: Reverse leakage current affects power consumption in standby or reverse bias conditions. The LSM340J/TR13 has 1.5 mA leakage at 40 V, while most substitutes have 500 µA. The STPS340S has only 20 µA. Lower leakage current reduces power loss and heat generation, particularly in applications with extended reverse bias operation.

Q: Are all substitute parts available in Tape & Reel packaging?

A: No. The LSM340J/TR13 is supplied in Tape & Reel (TR) format. B340Q-13-F, SK34-TP, SS34-E3/9AT, SS34-M3/57T, and B350-13-F are available in Tape & Reel. B340-13-F and SS34-E3/57T are available in Cut Tape & Digi-Reel format. SS34 packaging format is not specified. Verify packaging format requirements for your manufacturing process.

Q: What is the operating temperature range difference between parts?

A: The LSM340J/TR13 operates from -55°C to 150°C. Most substitutes operate to 125°C maximum, except B340Q-13-F, SK34-TP, and STPS340S, which operate to 150°C. For applications requiring full -55°C to 150°C operation, select B340Q-13-F, SK34-TP, or STPS340S.

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